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Wednesday, June 01, 2005

The Ger/CB/1912, redesigned

I wanted to try the Ger/CB/1912 design, using what I learned about gun positioning in Springsharp (from the Red Admiral). I did this, hoping that I would be able to lower the displacement.

The result was that I was able to achieve a lower displacement. This was intended to smaller, but the result is not too bad. The speed is 32 knots maximum and a 15 knot cruising speed for 7,500 nm. The armament is 6-15in/45, all forward in triple turrets. The secondary armament is too light at 8-6in/50 QF guns. The side armor is inclined outwards, but there is a very thick deck. A 6in deck almost makes this like a protected cruiser, but there is 6in inclined side armor as well. This is the Springsharp report:
Ger/CB/1912, Germany Battlecruiser laid down 1912 (Engine 1927)

Displacement:
 34,692 t light; 36,011 t standard; 38,307 t normal; 40,144 t full load

Dimensions: Length overall / water x beam x draught
 822.00 ft / 820.00 ft x 105.00 ft x 34.00 ft (normal load)
 250.55 m / 249.94 m x 32.00 m  x 10.36 m

Armament:
     6 - 15.00" / 381 mm guns (2x3 guns), 1,687.50lbs / 765.44kg shells, 1912 Model
   Breech loading guns in turrets (on barbettes)
   on centreline, all forward, 1 raised mount - superfiring
     8 - 6.00" / 152 mm guns in single mounts, 100.00lbs / 45.36kg shells, 1912 Model
   Quick firing guns in deck mounts with hoists
   on side, all amidships
 Weight of broadside 10,925 lbs / 4,955 kg
 Shells per gun, main battery: 90

Armour:
  - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 540.00 ft / 164.59 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 101 % of normal length

  - Torpedo Bulkhead:
  2.00" / 51 mm 540.00 ft / 164.59 m 29.00 ft / 8.84 m

  - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 10.0" / 254 mm 6.00" / 152 mm  10.0" / 254 mm
 2nd: 2.00" / 51 mm       -         -

  - Armour deck: 6.00" / 152 mm, Conning tower: 6.00" / 152 mm

Machinery:
 Oil fired boilers, steam turbines,
 Direct drive, 4 shafts, 172,522 shp / 128,701 Kw = 32.00 kts
 Range 7,500nm at 15.00 kts
 Bunker at max displacement = 4,134 tons

Complement:
 1,368 - 1,779

Cost:
 £3.130 million / $12.522 million

Distribution of weights at normal displacement:
 Armament: 1,374 tons, 3.6 %
 Armour: 11,684 tons, 30.5 %
    - Belts: 2,331 tons, 6.1 %
    - Torpedo bulkhead: 1,159 tons, 3.0 %
    - Armament: 1,910 tons, 5.0 %
    - Armour Deck: 6,137 tons, 16.0 %
    - Conning Tower: 147 tons, 0.4 %
 Machinery: 5,446 tons, 14.2 %
 Hull, fittings & equipment: 16,188 tons, 42.3 %
 Fuel, ammunition & stores: 3,616 tons, 9.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   59,003 lbs / 26,763 Kg = 35.0 x 15.0 " / 381 mm shells or 8.6 torpedoes
 Stability (Unstable if below 1.00): 1.14
 Metacentric height 6.9 ft / 2.1 m
 Roll period: 16.8 seconds
 Steadiness - As gun platform (Average = 50 %): 73 %
   - Recoil effect (Restricted arc if above 1.00): 0.57
 Seaboat quality  (Average = 1.00): 1.47

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.458
 Length to Beam Ratio: 7.81 : 1
 'Natural speed' for length: 28.64 kts
 Power going to wave formation at top speed: 50 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 0.00 degrees
 Stern overhang: 2.00 ft / 0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  35.00 ft / 10.67 m
    - Forecastle (20 %): 30.00 ft / 9.14 m
    - Mid (62 %):  30.00 ft / 9.14 m (22.00 ft / 6.71 m aft of break)
    - Quarterdeck (15 %): 22.00 ft / 6.71 m
    - Stern:  22.00 ft / 6.71 m
    - Average freeboard: 27.36 ft / 8.34 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 90.7 %
  - Above water (accommodation/working, high = better): 209.1 %
 Waterplane Area: 55,286 Square feet or 5,136 Square metres
 Displacement factor (Displacement / loading): 114 %
 Structure weight / hull surface area: 194 lbs/sq ft or 947 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.76
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent
 Ship has slow, easy roll, a good, steady gun platform
 Good seaboat, rides out heavy weather easily

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